Disk motor with bearing prestressing feature

a technology of prestressing and bearings, applied in the direction of magnetic circuit rotating parts, magnetic circuit shapes/forms/construction, instruments, etc., can solve the problems of two ball bearings with the associated additional assembly/installation costs, not contributing to the whole generation of torque, and the arrangement of ball bearings

Inactive Publication Date: 2004-03-02
IMM INST FUR MIKROTECHNIK GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this arrangement, however, is that there are two ball bearings arranged one above the other and separated by some distance.
This disk motor has the following disadvantages: first there are two ball bearings with the associated additional assembly/installation costs; and second, the flux-return circuit does not run exclusively through the active region of the coils and thus does not contribute wholly to the generation of torque

Method used

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  • Disk motor with bearing prestressing feature
  • Disk motor with bearing prestressing feature
  • Disk motor with bearing prestressing feature

Examples

Experimental program
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Embodiment Construction

The embodiment relates to a design as shown schematically in FIGS. 2 and 3. The disk motor has an outside diameter of 12.8 mm and is 1.4 mm high.

The motor has a torque constant of 0.40 .mu.Nm / Ma. The motor can easily be used for rotational speeds of up to 20,000 rpm while exhibiting good running characteristics.

Due to the design, the ball bearing is not influenced by the magnetic field. An attractive force in the Mn range is exerted by the magnetic prestressing.

The annular permanent magnet is manufactured by means of micro injection molding or sizing of an NdFeB powder containing a plastic as binder. The annular magnet is approximately 300 .mu.m thick. The annular magnet is axially magnetized such that it has eight poles (four pole pairs) on the end face.

Miniaturized flat coils are manufactured by means of UV-deep lithography and subsequent galvanic precipitation.

The flat coils comprise two superimposed printed conductors separated by a polyimide film as a carrier. There are six coi...

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Abstract

The invention relates to a disk motor with an armature disk, which is rotatably mounted and provided with permanent magnets, and with a stator which comprises a stator plate which is equipped with coils. The aim of the invention is to provide a disk motor that is as flat as possible and that is characterized by an improved smoothness of running. To this end, an annular soft-magnetic prestressing device is arranged concentrically on the stator plate in such a manner that at least one section of the prestressing device is located below the coil window of the coils in the axial direction. The armature disk may support an annular flux-return element opposite which the annular prestressing device is located in the radial direction. Said prestressing device has a cross-sectional contour that guides the magnetic lines of electric flux from the annular flux-return element to the coil window.

Description

DESCRIPTION1. Field of the InventionThe invention relates to a disk motor with an armature disk (3), which is rotatably mounted and provided with permanent magnets, and with a stator comprising a stator plate which is equipped with coils.2. Background of the InventionSuch disk motors are used as direct drives for turntables, for example. A basic explanation of disk motors can be found in H.-D. Stolting, A. Beisse, Elektrische Kleinmaschinen, Verlag Teubner, 1987, p. 169ff and p. 186ff.DE 34 25 805 A1 discloses a DC motor realized as a disk motor to rotate a mirror. The stator comprises a coil-insulating frame and a stator flange connected thereto, which flange completely encloses the rotor and protects it from external influences. The rotor has a shaft which is attached to the mirror and which has on its lower end a magnet holder equipped with a two-pole permanent magnet. The rotor shaft ts punted in two ball bearings secured in the stator flange. To minimize axial play, the outer r...

Claims

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Application Information

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IPC IPC(8): H02K5/173H02K1/27H02K3/46H02K21/12H02K15/03H02K21/24H02K3/47G11B19/20H02K5/04
CPCH02K5/1737H02K1/27H02K3/47H02K15/03H02K21/24
Inventor EHRFELD, WOLFGANGSTOLTING, HANS-DIETERMICHEL, FRANKNIENHAUS, MATTHIASKLEEN, STEPHAN
Owner IMM INST FUR MIKROTECHNIK GMBH
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